A game spectating system that leverages game metadata to allow spectators to join or “step into” games being broadcast. Broadcast content may include user interface elements via which spectators can order, purchase, or otherwise obtain demo or full versions of games. Game client software and game data may be obtained and downloaded to the spectator's devices via the spectating system interfaces and broadcast streams. Spectators can order, purchase, or otherwise obtain characters, avatars, and gear for participation in particular games. Using the spectating UI to obtain the game client software, game data, characters, and gear via the broadcast streams, the spectators may join live game sessions of online games, start new game sessions, and/or replay previously recorded game sessions.